Torque fluctuation absorbing apparatus having structure for reducing misalignment of torque limiter during assembling thereof, and method for assembling the same

Abstract

A torque fluctuation absorbing apparatus includes a flywheel coupled to an engine crankshaft, a damper assembly disposed between the flywheel and the driven-side input shaft and including a pair of drive plates, a driven plate and spring dampers, and a torque limiter disposed between the flywheel and the damper assembly and including a pair of linings that are adapted to slip when receiving at least a predetermined amount of torque. In fabricating the apparatus, the drive plates and the linings are centered with each other and assembled into a damper-torque limiter assembly, while the lining support plate is centered with respect to the flywheel, such that the damper-torque limiter assembly is fixed at the lining support plate to the flywheel.

1. A torque fluctuation absorbing apparatus provided between a crankshaft of an engine and a driven-side input shaft, comprising:
 a flywheel coupled to the crankshaft; 
 a damper assembly disposed in a torque transmission path between the flywheel and the driven-side input shaft, the damper assembly including a pair of drive plates, a driven plate and at least one spring damper; and 
 a torque limiter disposed in a torque transmission path between the flywheel and the damper assembly, the torque limiter including a pair of linings which generate relative rotational slip between the flywheel and the damper assembly when a torque larger than a predetermined amount is transmitted, 
 wherein the linings of the torque limiter are fixed to one of the drive plates of the damper assembly, and the torque limiter includes a pair of damper covers between which the linings are interposed via a coned disc spring, and the drive plates and damper covers are centered with respect to each other, whereby the damper assembly and the torque limiter are assembled to a damper-torque limiter assembly, and the damper-torque limiter assembly is fixed to the flywheel via the damper covers, further comprising a bush that is disposed in a radial clearance between one of the drive plates and a damper cover of the pair of damper covers that forms a part of the torque limiter, so as to support the drive plate and the damper cover. 
 
   
   
     2. A torque fluctuation absorbing apparatus according to  claim 1 , further comprising a bush that is disposed in a radial clearance between the drive plates and a hub of the driven plate. 
   
   
     3. A torque fluctuation absorbing apparatus provided between a crankshaft of an engine and a driven-side input shaft, comprising:
 a flywheel coupled to the crankshaft; 
 a damper assembly disposed in a torque transmission path between the flywheel and the driven-side input shaft the damper assembly including a pair of drive plates, a driven plate and at least one spring damper; and 
 a torque limiter disposed in a torque transmission path between the flywheel and the damper assembly, the torque limiter including a pair of linings which generate relative rotational slip between the flywheel and the damper assembly when a torque larger than a predetermined amount is transmitted, 
 wherein the linings of the torque limiter are fixed to one of the drive plates of the damper assembly, and the torque limiter includes a pair of damper covers between which the linings are interposed via a coned disc spring, and the drive plates and damper covers are centered with respect to each other, whereby the damper assembly and the torque limiter are assembled to a damper-torque limiter assembly, and the damper-torque limiter assembly is fixed to the flywheel via the damper covers, further comprising a bush that is disposed in a radial clearance between one of the drive plates and a hub of the driven plate. 
 
   
   
     4. A torque fluctuation absorbing apparatus provided between a crankshaft of an engine and a driven-side input shaft, comprising:
 a flywheel coupled to the crankshaft; 
 a damper assembly disposed in a torque transmission path between the flywheel and the driven-side input shaft, the damper assembly including a pair of drive plates, a driven plate and at least one spring damper; and 
 a torque limiter disposed in a torque transmission path between the flywheel and the damper assembly, the torque limiter including a pair of linings which generate relative rotational slip between the flywheel and the damper assembly when a torque larger than a predetermined amount is transmitted, 
 wherein the torque limiter includes a pair of damper covers, and the pair of linings of the torque limiter secured to a drive plate of the pair of drive plates are sandwiched between one of the damper covers and a holding plate provided via a coned disc spring on the inner side of the other damper cover, and the drive plates and damper covers are centered with respect to each other, whereby the damper assembly and the torque limiter are assembled into a damper-torque limiter assembly, and the damper-torque limiter assembly is fixed to the flywheel via the damper covers, further comprising a bush that is disposed in a radial clearance between the drive plates and a damper cover of the pair of damper covers that forms a part of the torque limiter, so as to support the drive plate and the damper cover. 
 
   
   
     5. A torque fluctuation absorbing apparatus according to  claim 4 , further comprising a bush that is disposed in a radial clearance between the drive plates and a hub of the driven plate. 
   
   
     6. A torque fluctuation absorbing apparatus according to  claim 4 , wherein the damper covers are centered by a pin to the flywheel. 
   
   
     7. A torque fluctuation absorbing apparatus provided between a crankshaft of an engine and a driven-side input shaft, comprising:
 a flywheel coupled to the crankshaft; 
 a damper assembly disposed in a torque transmission path between the flywheel and the driven-side input shaft, the damper assembly including a pair of drive plates, a driven plate and at least one spring damper; and 
 a torque limiter disposed in a torque transmission path between the flywheel and the damper assembly, the torque limiter including a pair of linings which generate relative rotational slip between the flywheel and the damper assembly when a torque larger than a predetermined amount is transmitted, 
 wherein the torque limiter includes a pair of damper covers, and the pair of linings of the torque limiter secured to a drive plate of the pair of drive plates are sandwiched between one of the damper covers and a holding plate provided via a coned disc spring on the inner side of the other damper cover, and the drive plates and damper covers are centered with respect to each other, whereby the damper assembly and the torque limiter are assembled into a damper-torque limiter assembly, and the damper-torque limiter assembly is fixed to the flywheel via the damper covers, further comprising a bush that is disposed in a radial clearance between the drive plates and a hub of the driven plate. 
 
   
   
     8. A torque fluctuation absorbing apparatus according to  claim 7 , wherein the damper covers are centered by a pin to the flywheel.